ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



431 



with the " Bactil " microscope is a new pattern of attachable mechanical 

 stage, designed by Dr. Murray for the examination of serial sections, 

 blood films, etc., and gives mechanical movements over 115 mm. by 

 85 mm. 



The method of attachment to the stage is a new one. The design 

 is simple, but mechanically good. 



Fig. 4.—" Physician's Outfit." 



Special attention is called to the series of apochromatic objectives. 

 They are four in number, as follows : 16 mm., S mm., 4 mm., 2 mm. 

 (oil immersion) ; and there is a new | in. cil-immersion objective of 

 • 9 N.A. 



The majority of workers on metal specimens with vertical illumina- 

 tion are in the habit of using both the prism and cover-glass patterns 

 of illuminator. A carrier has been designed into which the prism or 



